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Abstract
I/O
Examples
Particulars
Required Reading
Version
Index_Entries

Abstract


   CSPICE_EKACEC adds data to a character column in the specified 
   record of an EK file.

   For important details concerning this module's function, please refer to
   the CSPICE routine ekacec_c.

I/O

   
   Given:
   
      handle      the scalar integer referring to an EK file open for 
                  write access
   
      segno       the scalar integer indicating EK segment number
                  for the new record
                  
      recno       the scalar integer indicating the index of the new
                  record
                  
      column      the string scalar name of the column for the new record
      
      nvals       the integer number of entries from 'cvals' to add to 
                  the new record
                  
      cvals_len   a scalar integer defining the length of the strings 
                  in the 'cvals' array
                  
      cvals       an array of strings containing the data values to
                  add to the new record in 'column'
   
                     Note: 'nvals' specifies the number of 'cvals'
                     entries written to the new record.
   
      isnull      a scalar boolean flagging whether the entry is null, if
                  equal to TRUE, cspice_ekacec reserves space for
                  record but does not add the record to the EK
   
   the call:
   
      cspice_ekacec, handle, segno, recno, column,  $
                     nvals, cvals_len, cvals, isnull
   
   adds 'nvals' of the 'cvals' array to column 'column' in segment 'segno',
   record 'recno', of the EK file referred to by 'handle'.
   
   

Examples


   Any numerical results shown for this example may differ between
   platforms as the results depend on the SPICE kernels used as input
   and the machine specific arithmetic implementation.

   
      ;;
      ;; Constants
      ;;
      EKNAME = "ekacec.ek"
      IFNAME = "Test EK/Enjoy"
      NCOLS  = 2
      NROWS  = 5
      NRESVC = 0
      TABLE  = "CHR_DATA"
      CVLEN  = 10
      MAXVAL = 10
      cvals  = strarr( MAXVAL )
      
      ;;
      ;; Open a new EK file.  For simplicity, we won't
      ;; reserve space for the comment area, so the 
      ;; number of reserved comment characters is zero. 
      ;; The constant IFNAME holds the internal file name. 
      ;;
      if ( cspice_exists (EKNAME) ) then begin
         file_delete, EKNAME
      endif
   
      ;;
      ;; Create and open a new EK file.
      ;;
      cspice_ekopn, EKNAME, IFNAME, NRESVC, handle
          
      ;;
      ;;   Set up the table and column names and declarations 
      ;;   for the CHR_DATA segment.
      ;;
      cdecls = strarr(NCOLS)
      cnames = strarr(NCOLS)
   
      ;;
      ;; Define the column names and formats.
      ;;
      cnames[0] = "CHR_COL_1"
      cdecls[0] = "DATATYPE = CHARACTER*(*), " +$
                  "INDEXED = TRUE, NULLS_OK = TRUE"
   
      cnames[1] = "CHR_COL_2"
      cdecls[1] = "DATATYPE = CHARACTER*(9), " +$
                  "SIZE = VARIABLE, NULLS_OK = TRUE"
          
     ;;
     ;; Start the segment.
     ;;
     cspice_ekbseg, handle, TABLE, NCOLS, cnames, cdecls, segno
   
      ;;
      ;; Loop over the number of rows, writing data to each column.
      ;;
      for i = 0, (NROWS-1) do begin
   
         ;;
         ;; Set the null flag for i == 1.
         ;;
         isnull =  ( i EQ 1 );
      
         ;;
         ;; Append a new record to the EK.
         ;;
         cspice_ekappr, handle, segno, recno
   
         ;;
         ;; Define the scalar.
         ;;
         cvals[0] = string(i + 350)
   
         ;;
         ;; Add the data to the EK in column 1.
         ;;
         cspice_ekacec, handle, segno, recno, cnames[0], 1, $
                        CVLEN, cvals, isnull
   
         ;;
         ;; Array-valued columns follow.
         ;;
         cvals[0] = string( 10*i )
         cvals[1] = string((10*i) + 1)
         cvals[2] = string((10*i) + 2)
         cvals[3] = string((10*i) + 3)
   
         ;;
         ;; Add the data to column 2.
         ;;
         cspice_ekacec, handle, segno, recno, cnames[1], 4, $
                        CVLEN, cvals, isnull
     
      endfor
   
      ;;
      ;; Close the file.
      ;;
      cspice_ekcls, handle
   
      ;;
      ;; Open the created file. Show the values added.
      ;;
      cspice_ekopr, EKNAME, handle
   
      for i = 0, (NROWS-1) do begin
       
         cspice_ekrcec, handle, segno, i, cnames[0], MAXVAL, $
                        CVLEN, cvals,  isnull
                     
         if ( NOT isnull ) then begin
            print, 'Data from column: ',cnames[0],'   record number: ',i
            print, cvals
            print   
         endif
    
         ;;
         ;; Array-valued columns follow.
         ;;
         cspice_ekrcec, handle, segno, i, cnames[1],  MAXVAL, $
                        CVLEN, cvals,  isnull
                     
         if ( NOT isnull ) then begin
            print, 'Data from column: ',cnames[1], '   record number: ',i
            print, cvals
            print   
         endif
   
      endfor
   
      ;;
      ;; End the file.
      ;;
      cspice_ekcls, handle
   
   IDL outputs:
   
      Data from column: CHR_COL_1   record number:        0
        350 
   
      Data from column: CHR_COL_2   record number:        0
          0         1         2         3 
   
      Data from column: CHR_COL_1   record number:        2
        352 
   
      Data from column: CHR_COL_2   record number:        2
         20        21        22        23 
   
      Data from column: CHR_COL_1   record number:        3
        353 
   
      Data from column: CHR_COL_2   record number:        3
         30        31        32        33 
   
      Data from column: CHR_COL_1   record number:        4
        354 
   
      Data from column: CHR_COL_2   record number:        4
         40        41        42        43 
   
   Note record 1 does not appear due to setting the 'isnull' flag
   to true for that record.

Particulars


   None.

Required Reading


   ICY.REQ
   EK.REQ

Version


   -Icy Version 1.0.0, 16-JUN-2003, EDW (JPL)

Index_Entries

 
   add character data to EK column 
   add data to EK 
   write character data to EK column 
 



Wed Apr  5 17:58:00 2017